Milwaukee 48-11-2425 2.5 Ah Battery Pack is a Lithium-Ion battery with a voltage of 12V. It is a lightweight and compact battery that weighs only 0.5 lb. The battery has a capacity of 2.5 Ah and is compatible with various Milwaukee power tools. It has a multicolor design with black and red colors. The battery pack has a height of 3-1/4 in, a length of 2 in, and a width of 1-7/8 in.